#3F66D9#3F66D9

#3F66D9 is a mid, vivid blue. Relative luminance 0.156; OKLCH L 54.7% C 0.182 H 266.3°. Best body text is #FFFFFF at 5.10:1 contrast (WCAG AA passes).

Color values

HEX	#3F66D9
RGB	rgb(63, 102, 217)
HSL	hsl(225, 67%, 55%)
HSV	hsv(225, 71%, 85%)
CMYK	cmyk(71%, 53%, 0%, 14.9%)
CIE-LAB	lab(46.40, 25.02, -63.05)
CIE-LCH	lch(46.40, 67.83, 291.65°)
OKLab	oklab(54.71% -0.0117 -0.1814)
OKLCH	oklch(54.71% 0.182 266.3)
XYZ	xyz(19.3213, 15.5673, 67.6187)
Luminance	0.1557 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F66D9 #D9B23F

analogous

#3FB3D9 #3F66D9 #653FD9

triadic

#3F66D9 #D93F66 #66D93F

tetradic

#3F66D9 #D93FB3 #D9B23F #3FD965

square

#3F66D9 #D93FB3 #D9B23F #3FD965

split-complementary

#3F66D9 #D9653F #B3D93F

monochromatic

#1A3584 #2449B7 #3F66D9 #728FE3 #A5B7ED

Accessibility & contrast

On white

5.10

#3F66D9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.11

#3F66D9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F66D9

5.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F66D9	#FFFFFF	#000000	##FFFFFF
##3F66D9	1.00	5.10	4.11	5.10
#FFFFFF	5.10	1.00	21.00	1.00
#000000	4.11	21.00	1.00	21.00
##FFFFFF	5.10	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1075DD

Deuteranopia (green-blind)

#0067D7

Tritanopia (blue-blind)

#008296

Achromatopsia (no color)

#6E6E6E

Design tokens & code

CSS

--color: #3f66d9;
/* rgb */ color: rgb(63, 102, 217);
/* oklch */ color: oklch(54.7% 0.182 266.3);

Tailwind

colors: {
  custom: {
    50: '#8791e5',
    500: '#3f66d9',
    950: '#000000',
  },
}

SCSS

$custom: #3f66d9;
$custom-light: #8791e5;
$custom-dark: #000000;

JSON

{
  "hex": "#3f66d9",
  "rgb": {
    "r": 63,
    "g": 102,
    "b": 217
  },
  "hsl": {
    "h": 224.805,
    "s": 66.957,
    "l": 54.902
  },
  "oklch": {
    "l": 0.54705,
    "c": 0.1818,
    "h": 266.3
  },
  "luminance": 0.15569
}

Semantic roles & 50–950 ramp

primary

#3F66D9

secondary

#DACA9A

accent

#BE3EEA

background

#F9F8FE

surface

#F1F0FC

border

#CBCBD5

text

#0D0C16

muted

#7E7D84

Preview Lab

Preview with #3F66D9

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →